A crack appears in the fluoride front

After surveying the growing evidence, a high-profile advocate has second thoughts about the safety of fluoride

By Michael Downey Special to The Toronto Star
April 25, 1999

Two years ago, parents in the United States began noticing the word ``poison'' on their toothpaste tubes.

The reason: U.S. drug regulators were beginning to doubt the safety of fluoride, particularly to children, and demanded warnings on the labels.

Health Canada has not followed the U.S. lead, although fluoride toothpaste here does carry a mild warning to avoid swallowing it. But attitudes toward fluoride in this country are also beginning to change.

Dr. Hardy Limeback is a leading Canadian fluoride authority who is often cited by health officials in their defense of fluoridated water. He is also a long-standing consultant to the Canadian Dental Association and a professor of dentistry at the University of Toronto.

But in an interview last week, he conceded that fluoride may be destroying our bones, our teeth and our overall health. Although he still believes fluoride in toothpaste is effective against tooth decay, he says it doesn't need to be added to our water and we may be taking unnecessary risks by doing so.

``There is no point swallowing fluoridated water. The only benefit comes with direct contact with the teeth.''

Limeback is currently studying fluoride buildup in the body, and his results, like those of other studies, are worrisome.

``What we're finding indicates a trend: Torontonians have double the fluoride levels in their hip bones compared to Montreal, where water is not fluoridated.''

What effect these high fluoride deposits in our bones will have is unclear, he says, ``but we know that in areas of the world where water is naturally high in fluoride, skeletal fluorosis is a widespread problem.''

Skeletal fluorosis is a debilitating condition that occurs when fluoride accumulates in bones, making them extremely weak and brittle. In parts of China, India and Turkey where water is naturally high in fluoride, residents tend to age early and die before the age of 50, weak, arthritic and hunched over. ``Old'' men of 30 drag themselves around, leaning on sticks; their bones shatter like glass when they fall. Women give birth to dead babies after pregnancies of only four months.

`Children under three should never use fluoridated toothpaste. Or drink fluoridated water. And baby formula must never be made up using Toronto tap water. Never'

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Dr. Hardy Limeback
Fluoride expert

The earliest symptom? Mottled and brittle teeth, a condition known as dental fluorosis. The condition weakens teeth, making them porous and thus easily stained. The mottled spots start off white but typically turn brown. It's permanent and recurring, and treating it is very costly.

If this description sounds familiar, there's a good reason. Limeback says ``most'' of the children he treats in his Mississauga practice suffer dental fluorosis, and by some estimates, 60 per cent of all children living in fluoridated areas have it.

What causes it in these children is not just the water. Young children do not have the reflexes to avoid swallowing toothpaste when brushing their teeth. Some even enjoy the taste of it. And because they're developing rapidly, children are more susceptible to the negative effects of fluoride buildup.